PortableApps Backup didn't do a full restore of my device
I have a device with a 30GB hard disk with about 20GB of stuff on it. I was doing some serious monkeying around with the device (a firmware upgrade), so I did the prudent thing of backing it up using PortableApps Backup to a zip file. This got everything AFAICT.
After problems with the firmware upgrade, I used PortableApps Backup to restore my files after deleting/recreating the partion and formatting it. I was somewhat dismayed to discover that only 13GB was restored. I noticed that particular folders were missing, so I used WinRAR to check the zip and those folders and their contents were present in the zip.